This is the only theme I can think of off hand that I can actually see which tab I'm on other than the theme that comes with Parrot. I certainly appreciate the contrast which makes that happen.
I'd like it better if it had the bright colors at the top and the bottom of the tab itself... still it serves the purpose and I gave you all 5 stars..

I typically have a couple hundred or more tabs open , even since I started using One Tab and it can be a challenge since many others don't seem to think of this basic concept.

Very Zen and functional, yet still has a good, clean look.
I tried doing something similar with Firefox Color and have various problems with that so it's not as easy as one might think.

Good job! I may try out the red as well.

Created a profile for this because you inspired me to get off my rear end and follow through with that.